package com.zbbt.sportslottery.ui.widget;

/* 

 * Copyright (C) 2012 The Android Open Source Project 

 * 

 * Licensed under the Apache License, Version 2.0 (the "License"); 

 * you may not use this file except in compliance with the License. 

 * You may obtain a copy of the License at 

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0 

 * 

 * Unless required by applicable law or agreed to in writing, software 

 * distributed under the License is distributed on an "AS IS" BASIS, 

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

 * See the License for the specific language governing permissions and 

 * limitations under the License. 

 */

import java.util.ArrayList;

import android.content.Context;

import android.content.res.TypedArray;

import android.os.Bundle;

import android.os.Parcel;

import android.os.Parcelable;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.util.AttributeSet;

import android.view.View;

import android.view.ViewGroup;

import android.widget.FrameLayout;

import android.widget.LinearLayout;

import android.widget.TabHost;

import android.widget.TabWidget;

/**
 * 
 * Special TabHost that allows the use of {@link Fragment} objects for its tab
 * 
 * content. When placing this in a view hierarchy, after inflating the hierarchy
 * 
 * you must call {@link #setup(Context, FragmentManager, int)} to complete the
 * 
 * initialization of the tab host.
 * 
 * 
 * 
 * <p>
 * 
 * Here is a simple example of using a FragmentTabHost in an Activity:
 * 
 * 
 * 
 * {@sample
 * 
 * development/samples/Support4Demos/src/com/example/android/supportv4/app/
 * 
 * FragmentTabs.java complete}
 * 
 * 
 * 
 * <p>
 * 
 * This can also be used inside of a fragment through fragment nesting:
 * 
 * 
 * 
 * {@sample
 * 
 * development/samples/Support4Demos/src/com/example/android/supportv4/app/
 * 
 * FragmentTabsFragmentSupport.java complete}
 */

public class FragmentTabHost extends TabHost implements

TabHost.OnTabChangeListener {

	private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

	private FrameLayout mRealTabContent;

	private Context mContext;

	private FragmentManager mFragmentManager;

	private int mContainerId;

	private TabHost.OnTabChangeListener mOnTabChangeListener;

	private TabInfo mLastTab;

	private boolean mAttached;

	static final class TabInfo {

		private final String tag;

		private final Class<?> clss;

		private final Bundle args;

		private Fragment fragment;

		TabInfo(String _tag, Class<?> _class, Bundle _args) {

			tag = _tag;

			clss = _class;

			args = _args;

		}

	}

	static class DummyTabFactory implements TabHost.TabContentFactory {

		private final Context mContext;

		public DummyTabFactory(Context context) {

			mContext = context;

		}

		@Override
		public View createTabContent(String tag) {

			View v = new View(mContext);

			v.setMinimumWidth(0);

			v.setMinimumHeight(0);

			return v;

		}

	}

	static class SavedState extends BaseSavedState {

		String curTab;

		SavedState(Parcelable superState) {

			super(superState);

		}

		private SavedState(Parcel in) {

			super(in);

			curTab = in.readString();

		}

		@Override
		public void writeToParcel(Parcel out, int flags) {

			super.writeToParcel(out, flags);

			out.writeString(curTab);

		}

		@Override
		public String toString() {

			return "FragmentTabHost.SavedState{"

			+ Integer.toHexString(System.identityHashCode(this))

			+ " curTab=" + curTab + "}";

		}

		public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {

			public SavedState createFromParcel(Parcel in) {

				return new SavedState(in);

			}

			public SavedState[] newArray(int size) {

				return new SavedState[size];

			}

		};

	}

	public FragmentTabHost(Context context) {

		// Note that we call through to the version that takes an AttributeSet,

		// because the simple Context construct can result in a broken object!

		super(context, null);

		initFragmentTabHost(context, null);

	}

	public FragmentTabHost(Context context, AttributeSet attrs) {

		super(context, attrs);

		initFragmentTabHost(context, attrs);

	}

	private void initFragmentTabHost(Context context, AttributeSet attrs) {

		TypedArray a = context.obtainStyledAttributes(attrs,

		new int[] { android.R.attr.inflatedId }, 0, 0);

		mContainerId = a.getResourceId(0, 0);

		a.recycle();

		super.setOnTabChangedListener(this);

	}

	private void ensureHierarchy(Context context) {

		// If owner hasn't made its own view hierarchy, then as a convenience

		// we will construct a standard one here.

		if (findViewById(android.R.id.tabs) == null) {

			LinearLayout ll = new LinearLayout(context);

			ll.setOrientation(LinearLayout.VERTICAL);

			addView(ll, new FrameLayout.LayoutParams(

			ViewGroup.LayoutParams.MATCH_PARENT,

			ViewGroup.LayoutParams.MATCH_PARENT));

			TabWidget tw = new TabWidget(context);

			tw.setId(android.R.id.tabs);

			tw.setOrientation(TabWidget.HORIZONTAL);

			ll.addView(tw, new LinearLayout.LayoutParams(

			ViewGroup.LayoutParams.MATCH_PARENT,

			ViewGroup.LayoutParams.WRAP_CONTENT, 0));

			FrameLayout fl = new FrameLayout(context);

			fl.setId(android.R.id.tabcontent);

			ll.addView(fl, new LinearLayout.LayoutParams(0, 0, 0));

			mRealTabContent = fl = new FrameLayout(context);

			mRealTabContent.setId(mContainerId);

			ll.addView(fl, new LinearLayout.LayoutParams(

			LinearLayout.LayoutParams.MATCH_PARENT, 0, 1));

		}

	}

	/**
	 * 
	 * @deprecated Don't call the original TabHost setup, you must instead call
	 * 
	 *             {@link #setup(Context, FragmentManager)} or
	 * 
	 *             {@link #setup(Context, FragmentManager, int)}.
	 */

	@Override
	@Deprecated
	public void setup() {

		throw new IllegalStateException(

		"Must call setup() that takes a Context and FragmentManager");

	}

	public void setup(Context context, FragmentManager manager) {

		ensureHierarchy(context); // Ensure views required by super.setup()

		super.setup();

		mContext = context;

		mFragmentManager = manager;

		ensureContent();

	}

	public void setup(Context context, FragmentManager manager, int containerId) {

		ensureHierarchy(context); // Ensure views required by super.setup()

		super.setup();

		mContext = context;

		mFragmentManager = manager;

		mContainerId = containerId;

		ensureContent();

		mRealTabContent.setId(containerId);

		// We must have an ID to be able to save/restore our state. If

		// the owner hasn't set one at this point, we will set it ourself.

		if (getId() == View.NO_ID) {

			setId(android.R.id.tabhost);

		}

	}

	private void ensureContent() {

		if (mRealTabContent == null) {

			mRealTabContent = (FrameLayout) findViewById(mContainerId);

			if (mRealTabContent == null) {

				throw new IllegalStateException(

				"No tab content FrameLayout found for id "

				+ mContainerId);

			}

		}

	}

	@Override
	public void setOnTabChangedListener(OnTabChangeListener l) {

		mOnTabChangeListener = l;

	}

	public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {

		tabSpec.setContent(new DummyTabFactory(mContext));

		String tag = tabSpec.getTag();

		TabInfo info = new TabInfo(tag, clss, args);

		if (mAttached) {

			// If we are already attached to the window, then check to make

			// sure this tab's fragment is inactive if it exists. This shouldn't

			// normally happen.

			info.fragment = mFragmentManager.findFragmentByTag(tag);

			if (info.fragment != null && !info.fragment.isDetached()) {

				FragmentTransaction ft = mFragmentManager.beginTransaction();

				// ft.detach(info.fragment);

				ft.hide(info.fragment);

				ft.commit();

			}

		}

		mTabs.add(info);

		addTab(tabSpec);

	}

	@Override
	protected void onAttachedToWindow() {

		super.onAttachedToWindow();

		String currentTab = getCurrentTabTag();

		// Go through all tabs and make sure their fragments match

		// the correct state.

		FragmentTransaction ft = null;

		for (int i = 0; i < mTabs.size(); i++) {

			TabInfo tab = mTabs.get(i);

			tab.fragment = mFragmentManager.findFragmentByTag(tab.tag);

			// if (tab.fragment != null && !tab.fragment.isDetached()) {

			if (tab.fragment != null) {

				if (tab.tag.equals(currentTab)) {

					// The fragment for this tab is already there and

					// active, and it is what we really want to have

					// as the current tab. Nothing to do.

					mLastTab = tab;

				} else {

					// This fragment was restored in the active state,

					// but is not the current tab. Deactivate it.

					if (ft == null) {

						ft = mFragmentManager.beginTransaction();

					}

					// ft.detach(tab.fragment);

					ft.hide(tab.fragment);

				}

			}

		}

		// We are now ready to go. Make sure we are switched to the

		// correct tab.

		mAttached = true;

		ft = doTabChanged(currentTab, ft);

		if (ft != null) {

			ft.commit();

			mFragmentManager.executePendingTransactions();

		}

	}

	@Override
	protected void onDetachedFromWindow() {

		super.onDetachedFromWindow();

		mAttached = false;

	}

	@Override
	protected Parcelable onSaveInstanceState() {

		Parcelable superState = super.onSaveInstanceState();

		SavedState ss = new SavedState(superState);

		ss.curTab = getCurrentTabTag();

		return ss;

	}

	@Override
	protected void onRestoreInstanceState(Parcelable state) {

		SavedState ss = (SavedState) state;

		super.onRestoreInstanceState(ss.getSuperState());

		setCurrentTabByTag(ss.curTab);

	}

	@Override
	public void onTabChanged(String tabId) {

		if (mAttached) {

			FragmentTransaction ft = doTabChanged(tabId, null);

			if (ft != null) {

				ft.commit();

			}

		}

		if (mOnTabChangeListener != null) {

			mOnTabChangeListener.onTabChanged(tabId);

		}

	}

	private FragmentTransaction doTabChanged(String tabId,

	FragmentTransaction ft) {

		TabInfo newTab = null;

		for (int i = 0; i < mTabs.size(); i++) {

			TabInfo tab = mTabs.get(i);

			if (tab.tag.equals(tabId)) {

				newTab = tab;

			}

		}

		if (newTab == null) {

			throw new IllegalStateException("No tab known for tag " + tabId);

		}

		if (mLastTab != newTab) {

			if (ft == null) {

				ft = mFragmentManager.beginTransaction();

			}

			if (mLastTab != null) {

				if (mLastTab.fragment != null) {

					//ft.detach(mLastTab.fragment);
					ft.hide(mLastTab.fragment);
					mLastTab.fragment.onPause();
					mLastTab.fragment.onStop();
				}

			}

			if (newTab != null) {

				if (newTab.fragment == null) {

					newTab.fragment = Fragment.instantiate(mContext,

					newTab.clss.getName(), newTab.args);

					ft.add(mContainerId, newTab.fragment, newTab.tag);

				} else {

					//ft.attach(newTab.fragment);
					ft.show(newTab.fragment);
					newTab.fragment.onStart();
					newTab.fragment.onResume();
				}

			}

			mLastTab = newTab;

		}

		return ft;

	}

}